Bestway Ocean Diver Mask & Snorkel Set The global human gut microbiome: genes, lifestyles, and diet: Trends in. Bestway Ocean Diver Mask & Snorkel Set offers a full face mask and snorkel designed for adults who love to explore the ocean. The set is perfect for freediving and features tempered glass for clear visibility. Available in blue and grey, this set is a must have for any ocean enthusiast over 14 years old. Bestway Ocean Diver Mask & Snorkel Set: Tempered glass aviator style lenses Double feathered edge skirt for precision leak resistant fit Fully adjustable split head strap Dry top snorkel technology prevents virtually all water infiltration Ortho engineered form fitted snorkel mouthpiece Integrated purge valve for easy water clearing Adjustable snorkel strap retainer Content: One mask, one snorkel Made in China